812981305 has 8 divisors (see below), whose sum is σ = 981028800. Its totient is φ = 646750896.

The previous prime is 812981261. The next prime is 812981317. The reversal of 812981305 is 503189218.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 812981305 - 2¹³ = 812973113 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 453285 + ... + 455074.

It is an arithmetic number, because the mean of its divisors is an integer number (122628600).

Almost surely, 2^812981305 is an apocalyptic number.

It is an amenable number.

812981305 is a deficient number, since it is larger than the sum of its proper divisors (168047495).

812981305 is a wasteful number, since it uses less digits than its factorization.

812981305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 908543.

The product of its (nonzero) digits is 17280, while the sum is 37.

The square root of 812981305 is about 28512.8270257440. The cubic root of 812981305 is about 933.3120068114.

The spelling of 812981305 in words is "eight hundred twelve million, nine hundred eighty-one thousand, three hundred five".